MirOS Manual: XCrossingEvent(3)


XCrossingEvent(3X11)     XLIB FUNCTIONS      XCrossingEvent(3X11)

NAME

     XCrossingEvent - EnterNotify and LeaveNotify event structure

STRUCTURES

     The structure for EnterNotify and LeaveNotify events con-
     tains:

     typedef struct {
          int type;                /* EnterNotify or LeaveNotify */
          unsigned long serial;    /* # of last request processed by server */
          Bool send_event;         /* true if this came from a SendEvent request */
          Display *display;        /* Display the event was read from */
          Window window;           /* ``event'' window reported relative to */
          Window root;             /* root window that the event occurred on */
          Window subwindow;        /* child window */
          Time time;               /* milliseconds */
          int x, y;                /* pointer x, y coordinates in event window */
          int x_root, y_root;      /* coordinates relative to root */
          int mode;                /* NotifyNormal, NotifyGrab, NotifyUngrab */
          int detail;
                                   /*
                                   * NotifyAncestor, NotifyVirtual, NotifyInferior,
                                   * NotifyNonlinear,NotifyNonlinearVirtual
                                   */
          Bool same_screen;        /* same screen flag */
          Bool focus;              /* boolean focus */
          unsigned int state;      /* key or button mask */
     } XCrossingEvent;
     typedef XCrossingEvent XEnterWindowEvent;
     typedef XCrossingEvent XLeaveWindowEvent;

     When you receive these events, the structure members are set
     as follows.

     The type member is set to the event type constant name that
     uniquely identifies it. For example, when the X server
     reports a GraphicsExpose event to a client application, it
     sends an XGraphicsExposeEvent structure with the type member
     set to GraphicsExpose. The display member is set to a
     pointer to the display the event was read on. The send_event
     member is set to True if the event came from a SendEvent
     protocol request. The serial member is set from the serial
     number reported in the protocol but expanded from the 16-bit
     least-significant bits to a full 32-bit value. The window
     member is set to the window that is most useful to toolkit
     dispatchers.

     The window member is set to the window on which the EnterNo-
     tify or LeaveNotify event was generated and is referred to
     as the event window. This is the window used by the X server
     to report the event, and is relative to the root window on
     which the event occurred. The root member is set to the root

XFree86                   Version 4.5.0                         1

XCrossingEvent(3X11)     XLIB FUNCTIONS      XCrossingEvent(3X11)

     window of the screen on which the event occurred.

     For a LeaveNotify event, if a child of the event window con-
     tains the initial position of the pointer, the subwindow
     component is set to that child. Otherwise, the X server sets
     the subwindow member to None. For an EnterNotify event, if a
     child of the event window contains the final pointer posi-
     tion, the subwindow component is set to that child or None.

     The time member is set to the time when the event was gen-
     erated and is expressed in milliseconds. The x and y members
     are set to the coordinates of the pointer position in the
     event window. This position is always the pointer's final
     position, not its initial position. If the event window is
     on the same screen as the root window, x and y are the
     pointer coordinates relative to the event window's origin.
     Otherwise, x and y are set to zero. The x_root and y_root
     members are set to the pointer's coordinates relative to the
     root window's origin at the time of the event.

     The same_screen member is set to indicate whether the event
     window is on the same screen as the root window and can be
     either True or False. If True, the event and root windows
     are on the same screen. If False, the event and root windows
     are not on the same screen.

     The focus member is set to indicate whether the event window
     is the focus window or an inferior of the focus window. The
     X server can set this member to either True or False. If
     True, the event window is the focus window or an inferior of
     the focus window. If False, the event window is not the
     focus window or an inferior of the focus window.

     The state member is set to indicate the state of the pointer
     buttons and modifier keys just prior to the event. The X
     server can set this member to the bitwise inclusive OR of
     one or more of the button or modifier key masks:
     Button1Mask, Button2Mask, Button3Mask, Button4Mask,
     Button5Mask, ShiftMask, LockMask, ControlMask, Mod1Mask,
     Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask.

     The mode member is set to indicate whether the events are
     normal events, pseudo-motion events when a grab activates,
     or pseudo-motion events when a grab deactivates. The X
     server can set this member to NotifyNormal, NotifyGrab, or
     NotifyUngrab.

     The detail member is set to indicate the notify detail and
     can be NotifyAncestor, NotifyVirtual, NotifyInferior,
     NotifyNonlinear, or NotifyNonlinearVirtual.

XFree86                   Version 4.5.0                         2

XCrossingEvent(3X11)     XLIB FUNCTIONS      XCrossingEvent(3X11)

SEE ALSO

     XAnyEvent(3X11), XButtonEvent(3X11),
     XCreateWindowEvent(3X11), XCirculateEvent(3X11),
     XCirculateRequestEvent(3X11), XColormapEvent(3X11),
     XConfigureEvent(3X11), XConfigureRequestEvent(3X11),
     XDestroyWindowEvent(3X11), XErrorEvent(3X11),
     XExposeEvent(3X11), XFocusChangeEvent(3X11),
     XGraphicsExposeEvent(3X11), XGravityEvent(3X11),
     XKeymapEvent(3X11), XMapEvent(3X11), XMapRequestEvent(3X11),
     XPropertyEvent(3X11), XReparentEvent(3X11),
     XResizeRequestEvent(3X11), XSelectionClearEvent(3X11),
     XSelectionEvent(3X11), XSelectionRequestEvent(3X11),
     XUnmapEvent(3X11), XVisibilityEvent(3X11)
     Xlib - C Language X Interface

XFree86                   Version 4.5.0                         3

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